ASP.NET笔记之 ListView 与 DropDownList的使用(解决杨中科视频中的问题)

2022-10-01 12:37:46

1、Repeater用来显示数据、ListView用来操作数据

InsertItemTemplate和updateItemTemplate
**Eval（显示数据）和Bind（双向绑定：不仅是需要展现，更需要把数据绑定到数据库中）

ItemPlaceholderID：占位符，决定占位，把头部（之上）和尾部（之下）分隔开
ItemTemplate：展示功能

自动生成的ListView需要调整的地方
（1、生成的样式要提到style中，不要用内联的方式
（2、ItemTemplate里面一半没必要用<asp:Label>展示只读数据，所以可以直接输出
<%#Eval("id")%>
(3、LayoutTemplate中必须有一个ItempPlaceholderID 的服务端控件
(4、LayoutTemplate中表头的位置要汉化，所有template中的不需显示的字段需删除或更改位置

2、事件
流程同Repeater：

//首先判断数据行的类型
e.Item.ItemType==ListViewItemType.DataItem

//把e.Item转化成ListViewDataItem才能拿到DataItem
ListViewDataItem lvDataItem=(ListViewDataItem)e.Item;
DataRowView rowView=(DataRowView)lvDataItem.DataItem;
//获得某一列
var xRow=(...DAL.DataSet1.T_UserRow)rowVIew.Row;
//获得某一列的值
xRow.Age、xRow.sName...etc.

3、具体注意
（1、设定相应的按钮、控件、Validator为童颜的ValidationGroup，
防止不同模板中的Validator互相干扰，
（2、将Cancel按钮中的CausesValidation="false"使得插入修改数据时
可以取消操作，这样即使在同一个分组内也可以不互相影响

4、给InsertItemplate增加默认值
//在ItemCreate属性中进入函数
if(e.Item.ItemType==ListViewItemType.InsertItem){
TextBox AgeText=（TextBox)e.Item.FindControl("AgeID");
AgeText.Text="20";
}

5、主键Guid：插入到数据库

（1、ListView的ItemInserting属性：
//要插入到数据库之前的数据的键值对
e.values["id"]=Guid.NewGuid();

（2、ListView的ItemUpdateing属性：
e.ItemIdex
e.OldValues//更新前的值
e.NewValues["Age"]//更新后的值
e.Cancel=true;//取消非法数据插入

ObjectDataSource
绑定id为guid 类型的时候

6、DropDrownList

（1、
//包含在DropDrownList中的项
<asp:ListItem value="man">男</asp:ListItem>

（2、
**后台代码：更新的时候
//找到ListView
//ListView1.Item[e.ItemIndex].FindControl("ID");
//它是一个DropViewList
DropDrownList d=(DropDrownList)listView1.Item[e.ItemIndex].FindControl("ID");
//赋值
e.NewValues=["字段"]=d.SelectedValue;

（3、
**后台代码：实现编辑时显示原先的数据
//有数据行
if(e.Item.ItemType==ListVIewDataList.DataItem){
//取控件
DropDownList d=(DropDownLIst)e.Item.FindControl("ID");

if(d!=null){
//取到这一行绑定的数据
ListViewDataItem lv=(ListViewDataItem)e.Item;
DataRowItem row=(dataRowItem)lv.DataItem;
//如果这一行有数据
if(row!=null){
//读取数据库该Row的值
var myRow=(项目名称.DAL.DataSetUsers.T_Users)row.Row;

//将读取打偶的Row值设置为下拉菜单中的选项
d.SelectedValue=myRow.字段;
}
}
}

（4、可以看不可以用 Enabled="false

友情链接管理：

效果：

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" alt="" />

存在问题总结：

（1、警告 1 元素“ListView”不是已知元素。原因可能是网站中存在编译错误，或者缺少 web.config 文件。 E:\code\Projects\WebSite_zzl01\友情链接\LinkUrl_Admin.aspx 39 10 友情链接

（2、onLinkTypeChange(this,'" + logoID.ClientID + "') 中传给前台javascript的ID不是客户端的ID，会导致显示和隐藏的功能无法实现，所以增加一个myID

： logoID.Attributes["myid"] = logoID.ClientID; 来传递参数

LinkUrl_Admin.aspx.cs

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using System.Web.UI;

 using System.Web.UI.WebControls;

 using System.Data;

 using ListView.DAL.DataSetLinksTableAdapters;

 namespace ListView

 {

     public partial class LinksMer : System.Web.UI.Page

     {

         protected void Page_Load(object sender, EventArgs e)

         {

         }

         protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)

         {

             if(e.Item.ItemType== ListViewItemType.DataItem)

             {

                 //ListViewItem lvi = (ListViewItem)e.Item.DataItem;

                 DataRowView drv = (DataRowView)e.Item.DataItem;

                 if(drv!=null)

                 {

                    var ll=(ListView.DAL.DataSetLinks.T_LinksRow)drv.Row;

                    DropDownList DropDownList1 = (DropDownList)e.Item.FindControl("DropDownList1");

                    DropDownList1.SelectedValue = ll.LinkType.ToString();

                 }

             }

         }

         protected void ListView1_ItemInserting(object sender, ListViewInsertEventArgs e)

         {

             DropDownList DropDownList1 = (DropDownList)e.Item.FindControl("DropDownList1");

             e.Values["LinkType"] = DropDownList1.SelectedValue;

             DataRowView drv = (DataRowView)e.Item.DataItem;

         }

         protected void ListView1_ItemUpdating(object sender, ListViewUpdateEventArgs e)

         {

             DropDownList DropDownList1 = (DropDownList)ListView1.Items[e.ItemIndex].FindControl("DropDownList1");

             e.NewValues["LinkType"]= DropDownList1.SelectedValue;

         }

         protected void ListView1_ItemCreated(object sender, ListViewItemEventArgs e)

         {

             //对于Insert、Item界面的初始化在ItemCreated比在ItemDataBound更好

             if (e.Item.ItemType == ListViewItemType.DataItem || e.Item.ItemType == ListViewItemType.InsertItem)

             {

                 DropDownList DropDownList1 = (DropDownList)e.Item.FindControl("DropDownList1");

                 TextBox LogoURLTextBox = (TextBox)e.Item.FindControl("LogoURLTextBox");

                 if (DropDownList1 != null&&LogoURLTextBox!=null)

                 {

                     LogoURLTextBox.Attributes["myid"] = LogoURLTextBox.ClientID;

                     DropDownList1.Attributes["onchange"] = "onLinkTypeChange(this,'" + LogoURLTextBox.ClientID + "')";

                     if (DropDownList1.SelectedValue == "Text")

                     {

                         //LogoURLTextBox.Visible = false;

                         LogoURLTextBox.Style["display"] = "none";

                     }

                 }

             }

         }

     }

 }

LinkUrl_Admin.aspx

 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="LinksMer.aspx.cs" Inherits="ListView.LinksMer" %>

 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

 <html xmlns="http://www.w3.org/1999/xhtml">

 <head runat="server">

     <title></title>

     <script src="js/jquery-1.4.2.min.js" type="text/javascript"></script>

     <script type="text/javascript">

         function onLinkTypeChange(src,logoTextId) {

                 if($(src).val()=="Text") {

                     $("input:text[myid=" + logoTextId+"]").hide();

                     //                   alert(logotextid);获取控件失败，待处理

                     //alert("input:text[myid=" + logoTextId + "]");

                 }

                 else {

                     $("input:text[myid=" + logoTextId + "]").show();

                 }

         }

     </script>

 </head>

 <body>

     <form id="form1" runat="server">

     <div>

         <asp:ObjectDataSource ID="ObjectDataSource1" runat="server"

             DeleteMethod="Delete" InsertMethod="Insert"

             OldValuesParameterFormatString="original_{0}" SelectMethod="GetData"

             TypeName="ListView.DAL.DataSetLinksTableAdapters.T_LinksTableAdapter"

             UpdateMethod="Update">

             <DeleteParameters>

                 <asp:Parameter Name="Original_Id" Type="Int64" />

             </DeleteParameters>

             <InsertParameters>

                 <asp:Parameter Name="SeqNo" Type="Int32" />

                 <asp:Parameter Name="SiteName" Type="String" />

                 <asp:Parameter Name="LinkType" Type="String" />

                 <asp:Parameter Name="SiteURL" Type="String" />

                 <asp:Parameter Name="LogoURL" Type="String" />

             </InsertParameters>

             <UpdateParameters>

                 <asp:Parameter Name="SeqNo" Type="Int32" />

                 <asp:Parameter Name="SiteName" Type="String" />

                 <asp:Parameter Name="LinkType" Type="String" />

                 <asp:Parameter Name="SiteURL" Type="String" />

                 <asp:Parameter Name="LogoURL" Type="String" />

                 <asp:Parameter Name="Original_Id" Type="Int64" />

             </UpdateParameters>

         </asp:ObjectDataSource>

         <asp:ListView ID="ListView1" runat="server" DataKeyNames="Id"

             DataSourceID="ObjectDataSource1" InsertItemPosition="LastItem"

             onitemdatabound="ListView1_ItemDataBound"

             oniteminserting="ListView1_ItemInserting"

             onitemupdating="ListView1_ItemUpdating"

             onitemcreated="ListView1_ItemCreated">

             <EditItemTemplate>

                 <tr style="">

                     <td>

                         <asp:Button ID="UpdateButton" runat="server" CommandName="Update" Text="更新" />

                         <asp:Button ID="CancelButton" runat="server" CommandName="Cancel" Text="取消" />

                     </td>

                     <td>

                         <asp:TextBox ID="SeqNoTextBox" runat="server" Text='<%# Bind("SeqNo") %>' />

                     </td>

                     <td>

                         <asp:TextBox ID="SiteNameTextBox" runat="server"

                             Text='<%# Bind("SiteName") %>' />

                     </td>

                     <td>

                         <asp:DropDownList ID="DropDownList1" runat="server">

                             <asp:ListItem Value="Text">文本</asp:ListItem>

                             <asp:ListItem Value="Pic">图片</asp:ListItem>

                         </asp:DropDownList>

                     </td>

                     <td>

                         <asp:TextBox ID="SiteURLTextBox" runat="server" Text='<%# Bind("SiteURL") %>' />

                     </td>

                     <td>

                         <asp:TextBox ID="LogoURLTextBox" runat="server" Text='<%# Bind("LogoURL") %>' />

                     </td>

                 </tr>

             </EditItemTemplate>

             <EmptyDataTemplate>

                 <table runat="server" style="">

                     <tr>

                         <td>

                             未返回数据。</td>

                     </tr>

                 </table>

             </EmptyDataTemplate>

             <InsertItemTemplate>

                 <tr style="">

                     <td>

                         <asp:Button ID="InsertButton" runat="server" ValidationGroup="insert" CommandName="Insert" Text="插入" />

                         <asp:Button ID="CancelButton" runat="server" ValidationGroup="insert" CommandName="Cancel" Text="清除" />

                     </td>

                     <td>

                         <asp:TextBox ID="SeqNoTextBox" runat="server" ValidationGroup="insert" Text='<%# Bind("SeqNo") %>' />

                         <asp:RequiredFieldValidator

                             ID="RequiredFieldValidator1" runat="server" ValidationGroup="insert" ErrorMessage="*" ControlToValidate="SeqNoTextBox" Display="Dynamic"></asp:RequiredFieldValidator>

                             <asp:CompareValidator

                                 ID="CompareValidator1" runat="server" ValidationGroup="insert" ErrorMessage="必须为整数" ControlToValidate="SeqNoTextBox" Type="Integer" Operator="DataTypeCheck" Display="Dynamic"></asp:CompareValidator>

                     </td>

                     <td>

                         <asp:TextBox ID="SiteNameTextBox" runat="server" ValidationGroup="insert"  MaxLength="50"

                             Text='<%# Bind("SiteName") %>' />

                             <asp:RequiredFieldValidator ID="RequiredFieldValidator2"

                                 runat="server" ValidationGroup="insert"  ErrorMessage="*" ControlToValidate="SiteNameTextBox"></asp:RequiredFieldValidator>

                     </td>

                     <td>

                         <asp:DropDownList ID="DropDownList1" ValidationGroup="insert"   runat="server" AutoPostBack="False">

                             <asp:ListItem Value="Text">文本</asp:ListItem>

                             <asp:ListItem Value="Pic">图片</asp:ListItem>

                         </asp:DropDownList>

                     </td>

                     <td>

                         <asp:TextBox ID="SiteURLTextBox" ValidationGroup="insert"  runat="server" Text='<%# Bind("SiteURL") %>' /><asp:RequiredFieldValidator

                             ID="RequiredFieldValidator3" ValidationGroup="insert"  runat="server" ErrorMessage="*" ControlToValidate="SiteURLTextBox"></asp:RequiredFieldValidator>

                     </td>

                     <td>

                         <asp:TextBox ID="LogoURLTextBox" ValidationGroup="insert"   runat="server" Text='<%# Bind("LogoURL") %>' />

                     </td>

                 </tr>

             </InsertItemTemplate>

             <ItemTemplate>

                 <tr style="">

                     <td>

                         <asp:Button ID="DeleteButton" runat="server" CommandName="Delete" Text="删除" />

                         <asp:Button ID="EditButton" runat="server" CommandName="Edit" Text="编辑" />

                     </td>

                     <td>

                         <asp:Label ID="SeqNoLabel" runat="server" Text='<%# Eval("SeqNo") %>' />

                     </td>

                     <td>

                         <asp:Label ID="SiteNameLabel" runat="server" Text='<%# Eval("SiteName") %>' />

                     </td>

                     <td>

                         <asp:DropDownList ID="DropDownList1" runat="server" Enabled="false">

                             <asp:ListItem Value="Text">文本</asp:ListItem>

                             <asp:ListItem Value="Pic">图片</asp:ListItem>

                         </asp:DropDownList>

                     </td>

                     <td>

                         <asp:Label ID="SiteURLLabel" runat="server" Text='<%# Eval("SiteURL") %>' />

                     </td>

                     <td>

                         <asp:Label ID="LogoURLLabel" runat="server" Text='<%# Eval("LogoURL") %>' />

                     </td>

                 </tr>

             </ItemTemplate>

             <LayoutTemplate>

                 <table runat="server">

                     <tr runat="server">

                         <td runat="server">

                             <table ID="itemPlaceholderContainer" runat="server" border="0" style="">

                                 <tr runat="server" style="">

                                     <th runat="server">

                                     </th>

                                     <th runat="server">

                                         序号</th>

                                     <th runat="server">

                                         网站名</th>

                                     <th runat="server">

                                         类型</th>

                                     <th runat="server">

                                         连接地址</th>

                                     <th runat="server">

                                         Logo地址</th>

                                 </tr>

                                 <tr ID="itemPlaceholder" runat="server">

                                 </tr>

                             </table>

                         </td>

                     </tr>

                     <tr runat="server">

                         <td runat="server" style="">

                         </td>

                     </tr>

                 </table>

             </LayoutTemplate>

         </asp:ListView>

     </div>

     </form>

 </body>

 </html>

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